| | Mansfield, WA | Manson, WA | United States |
| Population | 331 | 1,294 | 329,725,481 |
| Female Population | 51.1% | 52.8% | 50.5% |
| Male Population | 48.9% | 47.2% | 49.5% |
| Median Age | 55.9 | 55.1 | 38.4 |
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| Population - 2010 | 320 | 1,296 | 309,327,143 |
| Population - 2000 | 319 | 1,182 | 285,036,114 |
| Population - 1990 | 311 | 907 | 251,960,433 |
| Pop. 2000 to Now | 5.6% | 34.0% | 15.6% |
| Pop. 1990 to Now | 8.4% | 74.6% | 30.8% |
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| Population Density | 1,015.3 | 1,032.7 | 93.4 |
| Land Area | 0.3 | 1.3 | 3,531,905.4 |
| Water Area | 0.0 | 0.0 | 264,836.8 |
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| Est. Total Population By Age | | | |
| | Mansfield, WA | Manson, WA | United States |
| Age 0 to 4 | 2.1% | 1.3% | 5.9% |
| Age 5 to 9 | 4.8% | 1.4% | 6.1% |
| Age 10 to 14 | 4.2% | 5.4% | 6.6% |
| Age 15 to 17 | 3.6% | 4.3% | 3.9% |
| Age 18 to 20 | 2.4% | 2.6% | 4.0% |
| Age 21 to 24 | 1.2% | 7.3% | 5.2% |
| Age 25 to 34 | 11.8% | 7.9% | 13.8% |
| Age 35 to 44 | 13.3% | 5.2% | 12.9% |
| Age 45 to 54 | 5.1% | 14.5% | 12.6% |
| Age 55 to 59 | 4.8% | 9.4% | 6.7% |
| Age 60 to 64 | 6.3% | 12.4% | 6.3% |
| Age 65 to 74 | 19.0% | 15.5% | 9.6% |
| Age 75 to 84 | 19.9% | 10.1% | 4.5% |
| Age 85 and over | 1.2% | 2.9% | 1.9% |
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| Race | | | |
| | Mansfield, WA | Manson, WA | United States |
| White | 90.9% | 72.1% | 59.4% |
| Black | 0.0% | 1.3% | 12.2% |
| Asian | 0.0% | 0.0% | 5.6% |
| Native American | 0.0% | 0.0% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.0% | 0.2% |
| Other | 0.0% | 0.0% | 0.4% |
| Two or More Races | 2.7% | 1.0% | 3.2% |
| Hispanic | 6.3% | 25.6% | 18.4% |
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| Marriage & Family | | | |
| | Mansfield, WA | Manson, WA | United States |
| Married Population | 60.2% | 48.2% | 49.8% |
| Currently Married | 57.8% | 43.1% | 48.0% |
| Married but Separated | 2.4% | 5.1% | 1.8% |
| Single Population | 39.8% | 51.8% | 50.2% |
| Never Married | 20.4% | 27.9% | 33.8% |
| Divorced | 15.3% | 12.6% | 10.8% |
| Widowed | 4.1% | 11.3% | 5.6% |
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| Household Size | 2.01 | 2.26 | 2.60 |
| Households | 165 | 570 | 124,010,992 |
| Family Households | 94 | 279 | 80,755,759 |
| Married couple, w/children | 17.0% | 21.1% | 30.5% |
| Married couple, no children | 68.1% | 64.9% | 42.9% |
| Non Family Households | 71 | 291 | 43,255,233 |
| Single householder, w/children | 12.8% | 14.0% | 15.8% |
| Single householder, no children | 2.1% | 0.0% | 10.8% |